. Chemistry: general, medical, and pharmaceutical, including the chemistry of the U. S. Pharmacopia. A manual on the general principles of the science, and their applications in medicine and pharmacy. S. P.(Corrosive Mercuric Chloride or Corrosive Chloride of Mercury), 202 THE METALLIC RADICALS. sublimes and condenses in the upper part of the tube in heavycolorless crystals or as a crystalline mass. Somewhat larger quantities (in proportion of 20 of sulphateto 16 of salt, and, vide infra, 1 of black manganese oxide) maybe sublimed in a pair of 2-ounce or 3-ounce round-bottomedgallipots, the on
. Chemistry: general, medical, and pharmaceutical, including the chemistry of the U. S. Pharmacopia. A manual on the general principles of the science, and their applications in medicine and pharmacy. S. P.(Corrosive Mercuric Chloride or Corrosive Chloride of Mercury), 202 THE METALLIC RADICALS. sublimes and condenses in the upper part of the tube in heavycolorless crystals or as a crystalline mass. Somewhat larger quantities (in proportion of 20 of sulphateto 16 of salt, and, vide infra, 1 of black manganese oxide) maybe sublimed in a pair of 2-ounce or 3-ounce round-bottomedgallipots, the one inverted over the other, and the joint luted by moist fireclay (the powderedFig. 36. clay kneaded with water to the consistence of dough). The lutinghaving been allowed to dry (some-what slowly to avoid cracks), thepots are placed upright on a sand-tray (plate-shape answers verywell), sand piled round the lowerand a portion of the upper pot, andthe whole heated over a good-sizedgas flame for an hour or more in afume-chamber (see Fig. 36—potsraised to show joint). Red mercuryiodide and calomel may be sub-limed in the same way. TheSublimation. former requires heat than corrosive , the latter more, HgS04 Mercuricsulphate. 2NaCl == HgCl2 + Na2S04 Sodium Mercuric Sodium chloride. chloride. sulphate. Note.—If the mercuric sulphate contain any mercurous sulphate,some calomel may be formed. This result will be avoided if 2 or 3per cent, of black manganese oxide be previously mixed with theingredients, the action of which is to eliminate chlorine from theexcess of sodium chloride used in the process, the chlorine convert-ing any calomel into corrosive sublimate. Sodium manganate anda lower manganese oxide are simultaneously produced. Precaution.—The operation is directed to be conducted with carein a fume-chamber, because the vapor of corrosive sublimate, whichmight possibly escape, is very acrid and highly poisonous. Mer-curic chloride volatilizes, though extremely
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